01Contract Renewal: contracts, evidence, and reliable reminders
A backend for reviewing contracts from PDF or Excel, preserving evidence, calculating notice deadlines, and publishing traceable, idempotent reminders.
CASOS_
Built systems, explained decisions.
Backend engineering case studies documenting the problem, API design, security controls and limits of each solution.
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02Webhook Delivery: reliable dispatch with retries and recovery
An asynchronous webhook engine with fan-out, a durable outbox, retries, a dead-letter queue, HMAC signing, tracing and failure recovery.
03Designing a Secure Editorial API for a Bilingual Technical Publication
A backend engineering case study covering the API, security controls and publishing workflow behind Bodan the Backend.